The impact of toroidal mode coupling on high-density discharges in J-TEXT

Peng DENG; Wenzhe MAO; Zhipeng CHEN; Yinan ZHOU; Peng SHI; Zhoujun YANG; Li GAO; Tao LAN; Jinlin XIE; Hong LI; Zian WEI; Adi LIU; Chu ZHOU; Weixing DING; Wandong LIU; Ge ZHUANG

doi:10.1088/2058-6272/ad659f

Plasma Science and Technology > 2024 > 26(12): 125101. > DOI: 10.1088/2058-6272/ad659f

Peng DENG, Wenzhe MAO, Zhipeng CHEN, Yinan ZHOU, Peng SHI, Zhoujun YANG, Li GAO, Tao LAN, Jinlin XIE, Hong LI, Zian WEI, Adi LIU, Chu ZHOU, Weixing DING, Wandong LIU, Ge ZHUANG. The impact of toroidal mode coupling on high-density discharges in J-TEXT[J]. Plasma Science and Technology, 2024, 26(12): 125101. DOI: 10.1088/2058-6272/ad659f

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The impact of toroidal mode coupling on high-density discharges in J-TEXT

1.
School of Nuclear Science and Technology, University of Science and Technology of China, Hefei 230026, People’s Republic of China
2.
State Key Laboratory of Advanced Electromagnetic Technology, International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics, School of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan 430074, People’s Republic of China
3.
Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, People’s Republic of China

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Author Bio:
Wenzhe MAO: maozhe@ustc.edu.cn
Corresponding author:
Wenzhe MAO, maozhe@ustc.edu.cn
Received Date: May 26, 2024
Revised Date: July 17, 2024
Accepted Date: July 18, 2024
Available Online: July 19, 2024
Published Date: October 30, 2024

Graphical Abstract

Abstract

Abstract

Density limit has long been a widely studied issue influencing the operating range of tokamaks. The rapid growth of the m/n = 2/1 (where m and n are poloidal and toroidal mode numbers, respectively) tearing mode is generally regarded as a primary precursor to the density limit disruption. In this experiment, the coupling of the m/n = 1/1 mode and the m/n = 2/1 mode in high-density plasma was observed. During a sawtooth cycle, the frequencies of the two modes gradually converge until they become equal. After that, toroidal coupling occurs between the 1/1 and 2/1 modes, resulting in a mutually fixed phase relationship. With the occurrence of toroidal coupling, the 2/1 mode is stabilized. Prior to the disruption, the cessation of the 1/1 and 2/1 mode coupling, along with the rapid growth in the amplitude of the 2/1 mode, can be observed. Additionally, under the same parameters, comparing discharges with or without the 1/1 mode, it is found that the presence of the 1/1 mode leads to higher plasma density and temperature parameters.
- toroidal coupling,
- tearing mode,
- density limit,
- sawtooth

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Acknowledgments

The authors would like to express their deepest gratitude to the J-TEXT team for their invaluable support and assistance. This work was supported by National Natural Science Foundation of China (Nos. 12175227 and 51821005), the Fundamental Research Funds for the Central Universities (No. USTC 20210079), and the Collaborative Innovation Program of Hefei Science Center, CAS (No. 2022HSC-CIP022).

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